[#37730] [Ruby 1.9 - Bug #4962][Open] come back gem_prelude! — Yusuke Endoh <mame@...>

24 messages 2011/07/02

[#37840] [Ruby 1.9 - Feature #4985][Open] Add %S[] support for making a list of symbols — Aaron Patterson <aaron@...>

23 messages 2011/07/07

[#37866] [Backport87 - Feature #4996][Open] About 1.8.7 EOL — Shyouhei Urabe <shyouhei@...>

22 messages 2011/07/08

[#37913] [Ruby 1.9 - Bug #5003][Open] Enumerator#next segfaults in OS X Lion (10.7) — Ganesh Gunasegaran <ganesh.gunas@...>

16 messages 2011/07/09

[#37917] [Ruby 1.9 - Feature #5005][Open] Provide convenient access to original methods — Lazaridis Ilias <ilias@...>

13 messages 2011/07/09

[#37932] [Ruby 1.9 - Feature #5008][Open] Equal rights for Hash (like Array, String, Integer, Float) — Suraj Kurapati <sunaku@...>

31 messages 2011/07/09

[#37936] [Ruby 1.9 - Feature #5010][Open] Add Slop(-like) in stdlib and deprecate current OptionParser API — Rodrigo Rosenfeld Rosas <rr.rosas@...>

29 messages 2011/07/09

[#37968] [Ruby 1.9 - Bug #5015][Open] method_added" is called in addition to "method_undefined — Lazaridis Ilias <ilias@...>

14 messages 2011/07/10

[#38096] [Ruby 1.9 - Feature #5033][Open] PATCH: 1.9: gc_mark_children: Avoid gc_mark() tail recursion, use goto again. — Kurt Stephens <ks.ruby@...>

14 messages 2011/07/16

[#38109] [Ruby 1.9 - Bug #5034][Open] C Source Code formatting — Lazaridis Ilias <ilias@...>

18 messages 2011/07/16

[#38171] [Ruby 1.9 - Bug #5047][Open] Segfault (most likely involving require) — Jack Christensen <jack@...>

21 messages 2011/07/18

[#38182] [Ruby 1.9 - Feature #5054][Open] Compress a sequence of ends — ANDO Yasushi ANDO <andyjpn@...>

68 messages 2011/07/19

[#38197] [Ruby 1.9 - Feature #5056][Open] About 1.9 EOL — Shyouhei Urabe <shyouhei@...>

39 messages 2011/07/19
[#38900] [Ruby 1.9 - Feature #5056] About 1.9 EOL — Shota Fukumori <sorah@...> 2011/08/10

[#38902] Re: [Ruby 1.9 - Feature #5056] About 1.9 EOL — Yukihiro Matsumoto <matz@...> 2011/08/10

Hi,

[#39048] Re: [Ruby 1.9 - Feature #5056] About 1.9 EOL — SASADA Koichi <ko1@...> 2011/08/22

Hi,

[#39055] Re: [Ruby 1.9 - Feature #5056] About 1.9 EOL — Lucas Nussbaum <lucas@...> 2011/08/23

On 23/08/11 at 06:50 +0900, SASADA Koichi wrote:

[#38295] [Ruby 1.9 - Feature #5064][Open] HTTP user-agent class — Eric Hodel <[email protected]>

15 messages 2011/07/21

[#38391] [Ruby 1.9 - Bug #5076][Open] Mac OS X Lion Support — Yui NARUSE <naruse@...>

17 messages 2011/07/22

[#38503] [Ruby 1.9 - Feature #5096][Open] offer Logger-compatibility for ext — Eric Wong <normalperson@...>

16 messages 2011/07/25

[#38510] [Ruby 1.9 - Feature #5097][Assigned] Supported platforms of Ruby 1.9.3 — Yui NARUSE <naruse@...>

42 messages 2011/07/26

[#38526] [Backport92 - Backport #5099][Open] Backport r31875 load path performance problem — Aaron Patterson <aaron@...>

19 messages 2011/07/26

[#38538] [Ruby 1.9 - Feature #5101][Open] allow optional timeout for TCPSocket.new — Eric Wong <normalperson@...>

15 messages 2011/07/27

[#38610] [Ruby 1.9 - Feature #5120][Open] String#split needs to be logical — Alexey Muranov <muranov@...>

18 messages 2011/07/30

[#38623] [Ruby 1.9 - Feature #5123][Open] Alias Hash 1.9 as OrderedHash — Alexey Muranov <muranov@...>

14 messages 2011/07/31

[ruby-core:37976] [Ruby 1.9 - Bug #4962][Closed] come back gem_prelude!

From: Motohiro KOSAKI <kosaki.motohiro@...>
Date: 2011-07-10 23:57:00 UTC
List: ruby-core #37976
Issue #4962 has been updated by Motohiro KOSAKI.

Status changed from Assigned to Closed

> MAKEFILE_CONFIG keeps make macros unexpanded.  So you should
> keep MAKEFILE_CONFIG not CONFIG, and expand it dynamically when
> the latter is accessed.

Then, I'll close this ticket.
Aaron, if you have a motivation of a respin, could you please create a new ticket ?
This thread is already too long and have multiple topics.
----------------------------------------
Bug #4962: come back gem_prelude!
http://redmine.ruby-lang.org/issues/4962

Author: Yusuke Endoh
Status: Closed
Priority: Normal
Assignee: Nobuyoshi Nakada
Category: lib
Target version: 1.9.3
ruby -v: -


Hello, rubygems developers

Kosaki-san noticed that 1.9.3 is slower than 1.9.2 on many benchmarks.
http://www.atdot.net/sp/view/5qunnl

I investigated and found that the cause is the lack of gem_prelude.rb.

Loading rubygems seems to create many objects and keep the references
to them.  See below:


$ ruby -ve 'GC.start; p ObjectSpace.count_objects[:TOTAL]'
ruby 1.9.2p180 (2011-02-18 revision 30909) [i686-linux]
9821

$ ./ruby -ve 'GC.start; p ObjectSpace.count_objects[:TOTAL]'
ruby 1.9.3dev (2011-07-01 trunk 32356) [i686-linux]
19638

$ ./ruby --disable-gems -ve 'GC.start; p ObjectSpace.count_objects[:TOTAL]'
ruby 1.9.3dev (2011-07-01 trunk 32356) [i686-linux]
9821


The number of live objects is proportional to the cost of GC mark phase.
You can actually confirm the performance degradation with the following
benchmark script:

  require 'tempfile'
  max = 200_000
  str = "Hello world!  " * 1000
  f = Tempfile.new('yarv-benchmark')
  f.write str
  GC::Profiler.enable
  max.times{
    f.seek 0
    f.read
  }
  p GC::Profiler.total_time


$ time ruby -v bm_io_file_read.rb
ruby 1.9.2p180 (2011-02-18 revision 30909) [i686-linux]
0.7280460000000308

real    0m3.965s
user    0m2.940s
sys     0m1.024s

$ time ./ruby -v bm_io_file_read.rb
ruby 1.9.3dev (2011-07-01 trunk 32356) [i686-linux]
1.396088000000029

real    0m4.786s
user    0m3.716s
sys     0m1.060s

$ time ./ruby --disable-gems -v bm_io_file_read.rb
ruby 1.9.3dev (2011-07-01 trunk 32356) [i686-linux]
0.7640390000000309

real    0m4.079s
user    0m2.872s
sys     0m1.192s


The performance degradation can be seen by not only such micro benckmarks,
but also my puzzle solvers :-(


There are some approaches to address the problem:

  1. to introduce a generational GC; this is impossible until 2.0 because
     it requires modifications to all extension libraries.

  2. to diet rubygems; do not create any string, array, hash, and any
     object as much as possible, and do not keep the references to them.

  3. to restore gem_prelude.rb to delay loading rubygems.

I guess that 3 is a reasonable choice for 1.9.3.  But I'm fine with any
solution to fix rubygems if 1.9.3 becomes as fast as 1.9.2 on the
benchmarks.

-- 
Yusuke Endoh <[email protected]>


-- 
http://redmine.ruby-lang.org

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